You deserve a ton of credit for enduring this situation as long as you have. I guess the most obvious question I would ask is what is motivating you to keep the marriage together? The story you have told of your marriage is mostly negative, which is totally understandable given the mood that you're currently in. But I have to wonder what the good parts of the marriage were and how long they lasted.
The title of your post is "never good enough" and if you were posting your story in a forum for emotional abuse, I would suspect that most of the responses would be in favor of a divorce. But you're posting your story in a Divorce Busting forum which indicates that you are still trying to make things work.
So this is a tough question to answer but do you think you're trying to keep the marriage together because you have become dependent on your husband or because you truly believe that the two of you have the potential to work towards an emotionally healthy relationship? No judgement either way, I'm just trying to the full picture.
M46 W48 M11 T14 S11 D8 BD: 2016/05/27 In-home separation: 2016/11/23 Nesting: 2017/06/11 W moves out: 2018/01/07 W goes public with OM: 2018/07/12 I ask for a divorce: 2018/12/14